Problem B: 求各位数字之和

#include <stdio.h> #include <stdlib.h> int main() {     int n,sum=0,m;     while(~scanf("%d",&n))     {         while(n>0)         {             m=n%10;             n=n/10;             sum+=m;         }         printf("%d\n",sum);         sum=0;     }     return 0; }